38 GLOSSARY 



TRUNCATE. Abrupt, as if cut off transversely. 

 TUBEROUS. Tuber-like. 

 TUMID. Swollen. 

 ULIGINOUS. Living in inud. 

 UNDULATE. Having a wavy edge. 

 URCEOLATE. Urn-shaped. 

 VASCULAR, Having vessels or ducts. 

 VEIN. A thread of fibro-vascular tissue in a leaf. 

 VEINLET. A secondary vein. 

 VELUM. The membranous indusium in Isoetes. 

 VENATION. The arrangement of the veins. 

 VERNATION. Phe arrangement of the leaf or leaf parts 

 in a bud. 



